Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9c33e82fe8cce445406933d59e8685748b87f46c3800ad3cc7e593d6eb9c71' 
  AND token = 'XhE/I2Snhv9r0bQm9BZ/0/oVEC1OuE2vqEIznSxLiPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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