Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f78c2023c1212a71db596154f0353fce1867e967d1010c04b17284d07aa0e08' 
  AND token = 'tMA37TdShDuUWQYng58Oz65yxOW2NaJRHmXvpLfU6VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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