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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a41a4f301c22666e4b6f8d4ee88c01a691560bef0f61938a9ceaa5bf91fd1b90' 
  AND token = 'LpyWirt3tjoDmApdrWHrwTNgpyHVrXJrtKZl4+OvM8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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