Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ddf30e77b15d8e4af35e8eb9dd62042ef4607e2971620f9cc5f5396780e5a2' 
  AND token = 'OM53kJkAF/xVXP5NJ5GY0cvEp0cz+IoxiS6yOjdnOwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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