Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65f596c2c0f57fd37e0abc93944f4f8b821f263418dc0fbb0557c59c82a0451' 
  AND token = 'ReT4FiCf43oDiShgOmvIWaJ4/OLtMyqzqxp+FcBRcjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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