Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e132f8ddd9a1d1d26be466848546d8d14f4f364835dd8d9701653be1ced66806' 
  AND token = 'cIpw6LAaGnGeGzgyUXQQBdrBWjvOESrc4AE36l0YQ/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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