SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7d628c8a656b66402c49c6d985e0c535a36c7cd22822ecff01727ebd497f0234' 
  AND token = 'IbRiHB4Nje/CBbkWsXqbU4jhHHBzSYavf8xKoxFz1p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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