Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5ceae85f64e1469ba5f176dfbbb6c93ac8486e3ddec9ff1b5f1465a00b3619' 
  AND token = 'jZWc54b2fVN84GhgkGUovegD9jNNjwtjSNRd9cn08XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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