Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc90bb2b4d0403a9be744740bedf0daf70a400652b164c3c9b0811ec71bf99d4' 
  AND token = 'z4yzdm0lB2MSPzYOhG1ke+TB5Y6xTJVBxVv9NAsqDUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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