Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef16c59b88d478d6da69a9a96a85d5af66974356b51867cc1110147cef982f1' 
  AND token = 'UpKievBAPhEwQUxTM6+TOMLILPtPmI7XdyERAvdktS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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