Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04b536075d40077c5816dbb4fc134df575467cd6b7fdd2ef3d54cf7f9368560' 
  AND token = 'C3oyvdhpa1YsjJfsVp5D2oCgSMUz2gOHrIM3tWEdi0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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