Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6717f68b7bd1e84fd47f2d6f4540a94e3ec0e254402b7218e4283a87b2b57024' 
  AND token = 'OTWtC3A88dwnQgRbW9TX6+PxTQcApXeLO3a+jB1MNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}