Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dbf326186798b42ec91465dc33f5fc03d50ff955cbf44e887946da8336ffa0' 
  AND token = '8+02vaNFzOPf80oAdYDyv1aV9EvvZvQvJpq/s6+La5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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