Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f705a6ce995fa18fd55f87980e8a8c0b0307de12e5359890d3ee68ca2bfa4235' 
  AND token = 'sCzwj9e1fp71P1tqRqlmfoamuGH86nFbE6fevJbYqJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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