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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '479c05998e5c3f74bdf9f381dfa6870c232b86848f7fe784e38abe6affc7cdd0' 
  AND token = 'hFs49Dko3iEYGemv78tCyKatNo+sFqI0LVVzVlLdqEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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