Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f7740d0fb5446165ff281f2578384db8870f1bc5ea3fda57191f887052dde1' 
  AND token = 'RJgkGQ63MlHN+L2wG8AqTD3T31GxLoFS8NfNfVsuRcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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