SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34ff8d0a0181ead2bf1346f7f011aca3bb65742d1558259c7034fa1214a959c1' 
  AND token = 'oeMbIuhFD0RK4xWyrPGJKSfONkfqks8/29ruBL7m+6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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