Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fd5d42ab42fb7fae970ecda333f16ef410f6689352195079403d4816514e3a' 
  AND token = 'xH5A9XedrvOPnAuurcql4exzhIDXXfopSDiudVzma2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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