Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dbfb378ec49197518cc519f976ecf9de4a41ff13b18bd063632259e69f63d1' 
  AND token = 'FMDaUKxDfzEP6O4KxVw4tLPZfH0hGswhI63iLNSQR5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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