Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0c200779e6ce35f1a64e2fc06006edaf777993f5617efcd4bd3400bb6f3d58' 
  AND token = 'U/ivmBlHWQhSAaLzn4yoS/U8xIpQFjntHM6shCw8SP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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