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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2899f685213c37909f0d77e3de6a215ec02ef7c81be17b0485f21af95a0bf258' 
  AND token = 'DkaFbT/kyJNLsoUbKRtB3twmlbRvpxSPt3oY1P2VP2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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