Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de51f7f1e7bdfc671c9427414c81b7a9d2782bbd78e45a53b3ed17a48928d82e' 
  AND token = 'rBd5IcqYXfjoUb8XQ4K9y0ymEvt/zC2qP+UdRd7aZRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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