Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255e423b63a77bd8aba8149cf8995f4ca288da073e4090664d3264d1486a419f' 
  AND token = 'PVfU6iu/IWrOSOX5n1bwcDDEqGILFkBDsDIXn3z52Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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