Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9db489d411f834613f4e2458c4af0430dd1d70a92e4c147228d60df28c83b63' 
  AND token = 'h8+Lrg01HaKbW3zXUIbm7VtAxTt5QGaUleRg1JT3HUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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