Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ce68dcc3bece9d541be677ce59e7f54c469617d8a6f41f781f3eac05370512c' 
  AND token = 'uQZalQSVw2PH7bagObdJwXxWYM8pJ8DdwYfjyb41m6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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