Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d041c4f1fd40ecdd1287a7d0588a98a0673bae50a92c3c514f1b562dc6edc8' 
  AND token = 'KdUfJhb79v/grY5yXUNGHGvJlG9Qe1b2AmJgHxjRyH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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