Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb992b15b2407a8164655b8bf3442ec013767f440feb9c4caf7b5664754b3ca4' 
  AND token = 'fdn9/nQ5onKjipOtWEYUcd50PYiwB7ZY/4UkkKTlaLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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