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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '21b83394db59995fa75f1785ed0fe3ce01864d0da21e9f1b413df045bad0234b' 
  AND token = 'TJNNfp4Lsz0uEX/0+poihjQCW9OBZdtvc/rnbf0Ue9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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