Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1d84c8931fa22a8216d2326e7bd969ea98802fd2cb3af7e309fd7ac89e31db' 
  AND token = 'qmDZmL7mmYyxiY0oB+FqUMavq041brR/eB1aOQ9CZw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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