Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9d175271591047ce4949f0e2702d2dc720f9fc99d1cc45dcdf3cde3c0785c8ed' 
  AND token = 'WGQMVagWvxrzcsdprxHMoKICBhrwcyFLhrXpJig2Kk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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