Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf5fa0c22157aa2bef2e52329ffe74a9453d19449f3b1dfa4d2e936d226ff57' 
  AND token = 'doDewnR7DAZLrN924qP36dEauNbZjbqrxRXiQQb2JHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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