Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8ef6307df04bbb02f8d33b5f9c0548fb2c7dae0b33fde074b358ec3ee354a1' 
  AND token = 'zw7ONULUpe0jup0jcshFXuZ/MutiQ0yB2I9rvUh/RZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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