Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515b74240eeb0f36b74aad2f4fdccca56d6d589e2b31b40ac5fb33737da92036' 
  AND token = 'R53RBbsdEN24Dg2wi8YWtwUGlQ00KH52ACZShwul0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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