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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0c6e9bce234a06143d994b13b92774f8c075f57acdb49e8c6e04f21b723e7252' 
  AND token = 'N0wVajNnrB2VXFvRcczPtgWamVpHC3soaFTUTe+Cy1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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