SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ac1abe158f8cb7754664539dfc41b45530cd69255d20ba3d846b569c0b14a4d4' 
  AND token = 'xWH2ArCS2HwgGcK7AXG0zBtqXeJQzO8eqAvy2wfkNAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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