Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8677d05cb30646d6de2dd95d28c7cb9f735f101a36f83715e1784ad91fc9da54' 
  AND token = 'ZNAkY73d1zRWCjUOcU75T83ZEVh4/6AbcS2iCnrWnsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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