Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af08e87cb36943de5c011b8407c6be518b89a8220edea2141955236dcfb7567a' 
  AND token = 'SQ0xiLxK0UnLvtiQMSLvQSdepaz2STTpQwSBzVuQvAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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