Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36251bbcfb390b5ec20b56fd7595dd8da6e23c112dbc9fe4b8646abcd02ef4aa' 
  AND token = 'QGz38YYKT8DmpttUB7bPloXNLDgpHmd0QEOgj1wJET4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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