Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa164f6c15afa294e61edd671d4c8113054b6851f3de89c4dba3a2fa7e6003c0' 
  AND token = 'bFkxpKDHOI8c0DFwRrCdY8/514uBrT6Vv+Eu7hFAdQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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