Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e3fc9d2b4955184221c4e813452eb9c66a947c604ce4b2d12fe9c1be6b2d5d' 
  AND token = 'wkgaUjWP9wWam2wSF4naV5UR509YtElFFCqORJY0880=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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