Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5bda2e10dab7078abbedadcee4617e83882e6e6186c8d10ba9c4c12929a3f7' 
  AND token = 'yXjrncUgD4XxfDSPOdimLcGN5LyRt5lUc/uiPLICoCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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