Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f760a9fbda4db7e81931270c26b570ef8fffcdd1939f4aa15a39163a9ec030e' 
  AND token = '9WPNVYcv3Nzqqyl9gtKg+oXifAoFjxqRvrT90MOLfSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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