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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6061da8787be87e564256ab8f4e5196410b6cb844f783bbd2ff9fbc76ccf510b' 
  AND token = 'nH0VNjqs5NANWYP0xDmS7eUysBA2MzrLy6z4FggpYWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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