Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4817eb9f516e7bc04826423a487674648844467eb388665938a2d38380e3cd3d' 
  AND token = 'Dq4bUZc2sfeupR41Rmk2h1uu8aaWeKihPWwdDMPjUTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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