Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2d51759274f7aa67677f99644558defcda7b2359f48c49477550632693801a' 
  AND token = 'Q5URNe2zvdUNAxRci8cv5PbjE/FchPOO5nInlo68vbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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