Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c231bc794bc715c01013ad279d15a843d8db1498d0833b7a9b91dca8eec72d4' 
  AND token = 'uIo1QAh1iCzb8RpWWZ6YD4aenoUx+Xr+7EShnMu4cdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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