Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f4ec23ec388e3002b056dce4d61c72bbbffe2495d0c24d6d81a85b916d89a90e' 
  AND token = '1iQLqv7TDAnWuRb1C/eJMZN9rjXKt/LfQXnb5JXD4lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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