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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5573f16768e95afdc41a9c8dfe1e776d8c5e2843dd57610fe03ce54107a4db79' 
  AND token = 'vwGmwq7srySN24R17JLcaW3eZj/Y+SOE2OXSnWnnLtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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