[en] Using the formalism of k_t-factorization we study exclusive photoproduction of lepton pairs γp → l⁺l^-p at high energies Wp > 100 GeV. Predictions for the γp → l⁺l^-p reactions are given using an unintegrated gluon distribution. We calculate the invariant mass distribution of the lepton pair at different energies. We also discuss whether the production of timelike virtual photons can be approximated by continuing to the spacelike domain q² < 0. The amplitude will be used to predict the cross-section for exclusive production of lepton pair in hadronic reaction. (author)