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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5455cbe2d6783aefb96ed19eacd154b46fbf1cd712c521907a0ee29f85d9e8da' 
  AND token = 'qQ0lRJPC+i9lZTYQ0aGz5qbknna/dFy0L34HUUxUyU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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