Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43727b7a86c8db6679c96b7289bc7a6cd343e7ff69d8737926fc4b0e8b38bbca' 
  AND token = 'rndD4DkJajHFhQ5imwsYr0HM7yxinzqKivihcrIBCtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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