Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea8b3f44fa46ec6415bd2ed555f2ad050fcf821af5bd76dd8c501575b52955dc' 
  AND token = 'lxkT1U58Eurr6ggM5/I+Pg84tiWptQjRgtPg7mY+egs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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