Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e7622ef1e90521ed384c0933caa0acdd4589ec3afc18f72d2ebe86d0280b36' 
  AND token = 'OMXVlPh1Pa+wtFFI5COII9SGzWjy/4JquE3dgBfAnDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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