Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbaad8ee2b860b13b8c4d2413f9f9951ed76b7cbfc5b7fd9b8bc8499ac9a0475' 
  AND token = 'pP6ezjc/MY1Q1I3syn13nYRe6f2h1hrLCHZR+uas8uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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