Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b539e0ba9914db56fad56bdf782b254ec15468d18e42b81e02dfcc29b1a1c3e' 
  AND token = 'GMT1bI91c3gwxdW7/tToDcUE8/5e8MlKEz6NdLtmeto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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