Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6cbaf60eebdca8041ee3d8f1297b575f1fc4c3f5256191f3aac3d9e9612e606' 
  AND token = 'Ynct5X1COwQjT1Eb32/BKoQcf6y7HEiJbZThJ7Dooqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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