Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e3659cd3a0b6fb94c069f288977a998a113867c02191afcae5d4e2e5a42b97' 
  AND token = '4lBYA3mgBypshb95nP65fU7G7OFDovnY2vJYhrKur0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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