Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f793bf64efbbdcfc0c489cb56cbac8da45e0bbe35139d710e7bfdfeedccafd' 
  AND token = '2pUbA2mfQxoeB3mLiFphqi72Akqdo+C9odO2okHscqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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