Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93fd7ab593d48ccd14853befd5249482e14438fdfddcc2e0bde3559a148d387' 
  AND token = 'tzbj9yxmTd1x4hWOlRgQVrVbqjTq5iVJM1QLBNE77Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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