Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2510603c82c7c085839e58a395730ef6259f55da4fc539adbeab15c9381dab7f' 
  AND token = 'oWbpg5EaE6m2bDeHF/wwyku4BytyERJQmbc2y4clOWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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