SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ee854b2a73db27d3851f96d3f84efdad7b3548e161bc99fd00fac6cc4f94f500' 
  AND token = 'rQUKYwTYDzClGBlxsZ6pfXx9X1+RVlFOursqt6O19ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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