SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32bf524d46398db4a6cebe48259269fe19c68b1891db5ff58073e306d3f23e0a' 
  AND token = '4QPD4IP7p7wuZXdDjAZnoS8/UBJroQVrqRyy6zLda2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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