Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '527472b748e7ef48e2411d59dc04c095db770919e7aeb923a3276f9e32cce90e' 
  AND token = 'O7z2CXqCjjdj9ccaBcCPZgbLaBXE5PJWEbOhAg7cvf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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