Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6b7d0ec96ccfd2f032558a9ad14ba1d45ed55248b56f63fc13e2014842877a' 
  AND token = 'u2Has/i8GaK5rNXgg7ydRzhECJ6Uh5oqEWzqU8HNMLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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