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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dee8768e35a95dc563509ff333f2decc292222c1440bac9b24f6780e4fb23235' 
  AND token = 'fKQZfsun50WueUwGHLCbc2gi1WEP8Ie/DZiCBEy3SgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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