Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca70432f46282a2ff1e19127b8f720c1f91f66c06fc3acff53c1e9c5741ea0a' 
  AND token = '6UwiQM0ADFKCV7hr8V8RJLeIgPe+5mGwdbJKanaYQb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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