Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e49e4b9d242f5e2ad9ff1ab167a1fb6ec20f1ce0fab37db4f436f3ee91f2428' 
  AND token = 'P85z+ZTfsUZIbPhU4EQzBqC2LCgylXwvTtEFr6cGECA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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