Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '181e50432572b3740a0f2a24af717697c443602672f30d7032d7f339ed5f8d8c' 
  AND token = '2X26vp7hTiewnDgTD3jbROzIFw0HTSF2an18mxQR2t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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