Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6dedf78cd0a124637b618f622fe3b3ef5f5ce2ebbc7238a70754206d157009' 
  AND token = 'WsHaLVWBxxaGtLlZfoA6yLtTqTv4jG6ynXIf+SIwGVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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