Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c0c4d94e4b39ae7829e8e8b11a47f7a4e694c035b26b9b8c05dcdeab78cd79' 
  AND token = 'uOUR+9+0qzDQSmdXC2L1svSG7pVVO+AsHRc6iQLKQ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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