Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826fb59dbaa4594eb5939754239359f41ee16d0341d6fa8cebf918f7bf7666a6' 
  AND token = '059ITHVnBLH3Jzp7sWYVEK9nyhd7T37ih46jqEXMULs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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