Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740083583716b83ed1434f891a6ced55adbd6e8c912c30525235ae575c9614ca' 
  AND token = 'LqCy233t3M2KKud0eEhBHSP0wkQeTZIAMjDufklfNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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