Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4d0c903318e50648ec5750053100779cbb8cba0e54aced384705411d2add08' 
  AND token = 'pUhFM8LxiGxMWhzW/+7Oj76lBtNcL/opm9+2JisBKOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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