Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2177d3554f52ebc67d3d38da82c2f2a50c268598bec64b6725db3acc6c816341' 
  AND token = '8btldrT3nrQ6x/WWnD5w0KxLf5omByxvD33kPa1NHMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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